8. Lasers Flashcards
1
Q
Gonna write down topic thats it
A
okay
2
Q
Define spontaneous emission
A
3
Q
Define stimulated emission
A
- Electron is at an excited state
- Photon passes in between energy levels
- If the photon is the
4
Q
How to calculate energy of the photon?
A
- No “-“ eV
- Based on wherever the electron’s state is in
- Convert to J
5
Q
State the abbreviations of laser
A
Light
Amplification
by
Stimulated
Emission
of
Radiation
6
Q
Define population inversion
A
When N2 (excited state) has more electrons than N1 (normal state)
7
Q
Difference between normal state and laser state
A
Normal state = N2 < N1
Laser state = N2 > N1
8
Q
Define pumping
A
The process of feeding energy into a system to create a population inversion where N2 > N1
9
Q
Define 3 level energy system
A
10
Q
What is the metastable energy level?
A
11
Q
Define 4 level energy system
A
12
Q
Laser design???
A
13
Q
Semiconductor lasers???
A
